IOS NSURL基本操作

原文鏈接：http://blog.csdn.net/zhibudefeng/article/details/7920686

NSURL其實就是我們在瀏覽器上看到的網站地址，這不就是一個字符串麼，爲什麼還要在寫一個NSURL呢，主要是因爲網站地址的字符串都比較複雜，包括很多請求參數，這樣在請求過程中需要解析出來每個部門，所以封裝一個NSURL，操作很方便：

NSURL *url = [NSURL URLWithString:@"http://www.baidu.com/s?tn=baiduhome_pg&bs=NSRUL&f=8&rsv_bp=1&rsv_spt=1&wd=NSurl&inputT=2709"];

    NSLog(@"Scheme: %@", [url scheme]);

    NSLog(@"Host: %@", [url host]);

    NSLog(@"Port: %@", [url port]);

    NSLog(@"Path: %@", [url path]);

    NSLog(@"Relative path: %@", [url relativePath]);

    NSLog(@"Path components as array: %@", [url pathComponents]);

    NSLog(@"Parameter string: %@", [url parameterString]);

    NSLog(@"Query: %@", [url query]);

    NSLog(@"Fragment: %@", [url fragment]);

    NSLog(@"User: %@", [url user]);

    NSLog(@"Password: %@", [url password]);

結果：

2012-08-29 15:52:23.781 NSurl[3560:f803] Scheme: http
2012-08-29 15:52:32.793 NSurl[3560:f803] Host: www.baidu.com
2012-08-29 15:52:39.102 NSurl[3560:f803] Port: (null)
2012-08-29 15:52:42.590 NSurl[3560:f803] Path: /s
2012-08-29 15:52:52.516 NSurl[3560:f803] Relative path: /s
2012-08-29 15:53:05.576 NSurl[3560:f803] Path components as array: (
    "/",
    s
)
2012-08-29 15:53:32.861 NSurl[3560:f803] Parameter string: (null)
2012-08-29 15:53:37.528 NSurl[3560:f803] Query: tn=baiduhome_pg&bs=NSRUL&f=8&rsv_bp=1&rsv_spt=1&wd=NSurl&inputT=2709
2012-08-29 15:53:52.942 NSurl[3560:f803] Fragment: (null)
2012-08-29 15:53:54.539 NSurl[3560:f803] User: (null)
2012-08-29 15:53:57.808 NSurl[3560:f803] Password: (null)